Every product is independently selected by (obsessive) editors. Things you buy through our links may earn New York a commission. As a freelance writer, I’ve had my fair share of lows. The many (many) times I never heard back about pitches, of course, or when the cashier at my bodega told me he liked my “ecofriendly” wardrobe after I showed up in the same outfit for the third day in a row. One of my lowest lows came almost a year ago, after a free — but definitely not complimentary — session with a trainer at a gym I’d joined. According to him, my cute mid-century desk chair at home was not meeting my ergonomic needs, and slumping had ravaged my posture, softened my core, and left me woefully misaligned. His prognosis: “I’ve never seen anything like this!” Apparently, I was on the verge of becoming the Quasimodo of Park Slope. But instead of investing my paltry freelance income into more verbal abuse from the trainer, I headed to Amazon, to find a more supportive (literally) option for rehabilitating my back. After cruising through reviews for various over-the-counter posture correctors, I narrowed my search to braces with armpit pads (underarm abrasion was a common complaint), l...